21033234545 has 8 divisors (see below), whose sum is σ = 25281059496. Its totient is φ = 16799135616.

The previous prime is 21033234539. The next prime is 21033234553. The reversal of 21033234545 is 54543233012.

It can be written as a sum of positive squares in 4 ways, for example, as 543029809 + 20490204736 = 23303^2 + 143144^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21033234545 - 2⁴ = 21033234529 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3428132 + ... + 3434261.

It is an arithmetic number, because the mean of its divisors is an integer number (3160132437).

Almost surely, 2^21033234545 is an apocalyptic number.

It is an amenable number.

21033234545 is a deficient number, since it is larger than the sum of its proper divisors (4247824951).

21033234545 is an equidigital number, since it uses as much as digits as its factorization.

21033234545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6863011.

The product of its (nonzero) digits is 43200, while the sum is 32.

Adding to 21033234545 its reverse (54543233012), we get a palindrome (75576467557).

The spelling of 21033234545 in words is "twenty-one billion, thirty-three million, two hundred thirty-four thousand, five hundred forty-five".